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texts 4,526
audio 330
movies 172
images 14
data 4
web 3
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Coal mines and mining 1,182
Mines and mineral resources 712
Mining engineering 678
Gold mines and mining 617
Mineral industries 279
Mining law 265
Metallurgy 242
Or 235
Mining 220
Natural gas 220
Natural gas pipelines 218
Strip mining 193
mining 190
Mining industry and finance 188
Electric engineering 163
Machinery 163
Photography 163
Aeronautics 162
Astronautics 162
Building 162
Chemical engineering 162
Chemistry, Technical 162
Cooking 162
Electronics 162
Handicraft 162
Home economics 162
Manufactures 162
Mechanical engineering 162
Motor vehicles 162
Nuclear engineering 162
Underwriters' Laboratories, Inc. National Board of Fire Underwriters 162
Coal 135
Charbon 127
Reclamation of land 120
Geology 104
Silver mines and mining 104
Copper mines and mining 101
Cornwall 86
Spoken Word 86
Mines 75
Petroleum engineering 66
Iron mines and mining 64
Coal leases 61
Mining corporations 61
Abroad 56
Sociétés minières 56
Mines et ressources minières 55
Radio 55
Abandoned coal mines 51
Environmental impact analysis 50
coal mines and mining 43
mineral industries 43
History 42
Homestake Mining Company 41
Mineralogy 41
Heritage 40
Redruth 40
Coal trade 39
ERIC Archive 39
data mining 38
Cuivre 37
anthracite coal 37
Gold 36
Hydraulic mining 36
Fer 35
Public lands 35
Mining machinery 34
Lead mines and mining 33
Mining claims 33
environment 33
Prospecting 32
Environmental impact statements 31
Data Mining 30
Land use 29
Argent 28
Diamond mines and mining 27
Mining schools and education 27
Molybdenum mines and mining 27
San Luis Mining Company 26
Cryptocurrency 25
Hearst, George, 1820-1891 25
Hearst, Phoebe Apperson, 1842-1919 25
Abandoned mined lands reclamation 24
Beel, Sigmund S 24
Charities 24
Clark, Edward Hardy, 1864-1945 24
Collectors and collecting 24
Crypto Mining 24
Cryptocurrency Exchanges 24
George Washington Memorial Association 24
Hearst Egyptian Expedition 24
Hearst, George Randolph 24
Hearst, John Randolph 24
Hearst, William Randolph, 1863-1951 24
Hearst, William Randolph, 1908-1993 24
Hilles, Florence Bayard, 1866-1954 24
Howard, John Galen, 1864-1931 24
Kindergarten 24
Kroeber, A. L. (Alfred Louis), 1876-1960 24
Lux School of Industrial Training (San Francisco, Calif.) 24
National Congress of Mothers (U.S.) 24
National Congress of Mothers and Parent-Teacher Associations (U.S.) 24
Nuttall, Zelia, 1858-1933 24
Panama-Pacific International Exposition (1915 : San Francisco, Calif.) 24
Pandacoin 24
Phoebe Hearst Architectural Plan for the University of California 24
Reisner, George Andrew, 1867-1942 24
Stevenson, Sara Yorke, 1847-1921 24
Uhle, Max, 1856-1944 24
United States. Congress. Senate 24
University of California (1868-1952) 24
University of California (1868-1952). Dept. of Anthropology 24
University of California (1868-1952). Regents 24
University of Pennsylvania. Dept. of Archaeology 24
Wheeler, Benjamin Ide, 1854-1927 24
CSAIP 23
Klondike (Mines d'or) 23
Mining law -- United States 23
Uranium mines and mining 23
Klondike gold rush 22
Gold mines and mining -- California 21
Klondike gold fields 21
Mining leases 21
Hydrology 20
Pennsylvania. Dept. of Mines 20
bub_upload 20
human rights 20
Anthracite coal 19
Pennsylvania. Department of Mines and Mineral Industries 19
Zinc mines and mining 19
Electricity in mining 18
Géologie 18
Indians of North America 18
Iron industry and trade 18
Platinum mines and mining 18
radio 18
Geology, Economic 17
Nickel mines and mining 17
Prospection 17
United States. Bureau of Land Management 17
gold 17
Human Rights 16
Iron ores 16
MINING 16
Mine safety 16
Nickel 16
Palladium 16
history 16
Golden Sunlight Mines, Inc 15
Ground control (Mining) 15
Mine subsidences 15
Pennsylvania. Department of Mines 15
Postsecondary Education 15
Water resources development 15
science 15
Agriculture 14
Solution mining 14
Technology 14
coal mining 14
water 14
DATA MINING 13
Gold mines and mining -- Alaska 13
Longwall mining 13
Mexico 13
Phosphate mines and mining 13
Railroads 13
Salt industry and trade 13
coal 13
culture 13
education 13
nuclear 13
pollution 13
2012 12
China 12
Coal mine waste 12
Conservation of natural resources 12
Cryptocurrency Mining 12
Data mining 12
Groundwater 12
Metals 12
Mines and mineral resources -- West (U.S.) 12
Stillwater Mining Company 12
United States 12
amandla 12
bituminous coal 12
privacy 12
uranium 12
Anaconda Nevada Moly Project 11
Coal Mining 11
Coal-mining machinery 11
Coke 11
Coke industry 11
Competency Based Education 11
Copper 11
ECONOMIC ASPECTS 11
Electric lines 11
Germany 11
Géologie économique 11
Job Skills 11
LEGAL ASPECTS 11
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